The manufacturer of Beanie Baby dolls used quarterly price data for 2005 / 2013 /V(1-1, 36) and the regression equation Pta+ bt+c₁ D1 1+ c2021+ c3 D3t to forecast doll prices in the year 2014. Pt is the quarterly price of dolls, and D1, D2, and D3, are dummy variables for quarters I, II, and I, respectively.

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